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Old 11-12-2008, 02:44 AM   #1
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Hi come someone explain what the differance between a .21 off road motor to a .21 onroad motor?

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Old 11-12-2008, 09:43 AM   #2
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I'm certainly no expert, but generally speaking offroad engines are designed to idle well and provide good throttle response in the low to mid revs whereas onroad engines are designed more to handle stresses created from running mostly high RPMs. Offroad heads need to be bigger also, due to constant throttle flucuation. My .02
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Old 11-12-2008, 10:55 AM   #3
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Port timing and the RPM range they run in. On road engines are designed for higher output but at a higher RPM and not really suitable for off road use in a buggy or truggy.
Adam Blevins Owner/Operator of AB Mods X-Dyno equipped and World Record holding engines!
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